Viết lại câu

Viết lại câu:
1. I don't know the address s I can't find your home
-> If ..........................................................................
2. This is the first time we have visited the palace
-> We have never .................................................
4. We are sending rescue worker to the flooded villages
-> Rescue worker ...........................................................
5. Mr. Backer helped the victims in the flooded areas
-> The victims .............................................................
6. Please keep the water clean or aquatic animals will die
-> If ....................................................................................